Correct option is B
The
measured size of the dimension of a component is referred to as the
actual size. It is the size obtained when the component is physically measured using instruments like a Vernier caliper, micrometer, or any other precision measuring device.
Basic Size:
The nominal size or starting point for calculating tolerances.
Example: If a hole's basic size is 25 mm, the tolerance may define the acceptable limits as 25.02 mm (upper limit) and 24.98 mm (lower limit).
Nominal Size:
A general size designation that may not precisely match the actual or basic size. It is often used for convenience in referencing standard sizes.
Example: A pipe nominally called 1 inch may have an actual inner diameter that differs slightly due to manufacturing tolerances.
Tolerance:
The permissible variation in size from the basic size.
Example: Tolerance of ±0.02 means the size can vary by 0.02 mm above or below the basic size.
